Specifically designed for DC applications including solar photovoltaic (PV) systems, the new OTDC switch-disconnectors are able to achieve 1000 VDC with only two poles.
Switch-disconnectors are largely used as the main switch in low voltage switchgear for power distribution, starting and stopping motors and isolating loads during maintenance. In the technically demanding PV system applications, the OTDS switches are relied upon to operate continuously in hot locations as well as break current and provide isolation at exceptionally high voltages.
The flexible, modular design of the OTDC switches allows the mechanism to be located at the side or between the poles. Four pole versions (2x1000 VDC) can be built for special applications such as two discrete DC circuits.
ABB's OTDC switch-disconnectors offer very generous insulation voltage ratings despite their compact size and the DC-rated operational voltage can be scaled up to 1200 V thanks to a carefully optimised arc dissipation plate design and Dual Magnetic Breaking (DMB) action. This flexibility can be achieved because of the modular design and without increasing the footprint area.
Key benefits of ABB's OTDC switch-disconnectors:
- Modular design with compact footprint
- Symmetrical power pole design allows connections to work in both ways
- Switch operation independent of the user (quick-make, quick-break)
- Robust design eliminates vulnerability to voltage peaks, making PV systems safe and reliable over a wide range of voltages